Beenaed j



B.' LA MOTHE. GAR AXLE.

No. 44,434. y Patented Sept. 27, 1864.

UNITED VSTATES PATENT QFFICE.

BERNARD J.. LA MorHE, 0F NEW Yo'nx, N. Y.

IMPROVEMENT IN CAR-AXLES.

, Specification forming part of Letters Patent No. 44,4311., dated September 27, 1864.

To all whom it may concern:

Beit known that I, BERNARD J. LA Moran, of the city" and State of New York, have invented, made, and applied to use a certain new and useful Improvement in Axles or Shnftsfor Railroad-Gars, &c.; and I do hereby declare tlnA following to be a'i'ull, clear.' and exact description of thesaid invention, reference being had to the annexed drawings, making part ot this specication, wherein- Finnres l, 2, and 3 are sections of axles or shafts representing my said improvements.

Similar letters denote the same parts. Railroad-earaxlesV and shattings generally are liable to breakage, because they are of only one piece ot' metal, and a aw or iinpertect Welding may not be noticed until broken apart by a strain.

rEhe object of my invention-is to obtain much greater strength and to remove liability of fracture without any increase in the weight ot the shaft or axle; and said invention consists in a series of tubes shrunk one over the other,`

so as to form a car-axle or shaft that will not easily bend or break, and is much stronger than the solid axle, and is not any heavier, and under most circumstances can be made considerably lighter than the ordinary axles.

4 1n the drawings, aI is the interior tube, of any desired size. b is a tube, the bore of which is slightly smaller than the external diameter of the pipe a, so that when heated the said pipeb'can be slipped over the pipe a and will, as it cools, contract firmly upon the pipe a and form nearly the same as if the pipes had been made together. I then shrink on a third pipe,

a b: c d are` shown shrunk upon the tubes lr,

previously prepared by shrinking on the suc- AThe projecting end It is to form thev journal or receive the wheel, as required.

In Fig. 2 I have shown a sleeve, l, shrunk upon the end of the axle to form a journal, and this can be removed when worn out.

In cases Where. pipes cannot be easily obtainedv ot' the desired sizes, strips of 'sheet metal, equal in width to the circumference of the respective pipes, may be used by bending them hp into a cylindiict'l forrn and placing them one inside or over the other, until the necessary thickness of shaft or axle is attained, and then vshrinking around the outer tube rings of iron atsuitable distances apart, and rivets may also be introduced crosswise throught-he axle or sllaift. Fig. 4 illustrates this mode of forming the pipe-axle.

The shorter pipes forming the journals at the ends of the axle or shaft may be screwed into the said hollen7 axle, if desired, and-be removable when worn out.

What I claim, and desire to secure by Letters Patent, in ,v

l. A series ot tubes introduced within or over each other to forni an axle or shaft, substantially as speciled.

2. A separate sleeve, l, shrunk upon the axle and forminga journal that can be removed when Worn out, as specified.

In witness whereof I have hereunto set'm y signature this 6th day of August, 18.64.

B. J. LA MOIH'E.

Witnesses: i

Trios. GEO. HAROLD, CHAs. H. SMITH. 

